package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrdersMapper;
import com.itheima.reggie.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrdersServiceImpl extends ServiceImpl<OrdersMapper, Orders> implements OrdersService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private UserService userService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     *
     * @param orders
     */
    @Override
    @Transactional
    public void submit(Orders orders) {
        //Orders(id=null, number=null, status=null, userId=null, addressBookId=1620712386774208513, orderTime=null, checkoutTime=null,
        //       payMethod=1, amount=null, remark=, userName=null, phone=null, address=null, consignee=null)
        //获取当前用户id
        Long userId = BaseContext.getCurrentId();
        //查询当前用户购物车数据
        LambdaQueryWrapper<ShoppingCart> shoppingCartLambdaQueryWrapper = new LambdaQueryWrapper<>();
        shoppingCartLambdaQueryWrapper.eq(ShoppingCart::getUserId,userId);

        List<ShoppingCart> shoppingCartList = shoppingCartService.list(shoppingCartLambdaQueryWrapper);

        if (shoppingCartList == null || shoppingCartList.size() == 0){
            throw new CustomException("购物车为空,不能下单");
        }

        //查询用户信息
        User user = userService.getById(userId);

        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);

        if (addressBook == null){
            throw new CustomException("用户地址信息有误，不能下单");
        }

        //生成订单号
        long numberId = IdWorker.getId();

        //声明一个线程安全的累加变量
        AtomicInteger amount = new AtomicInteger(0);

        //设置订单明细
        List<OrderDetail> orderDetailList = shoppingCartList.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(numberId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            // 计算公式: 菜品的金额 乘以(multiply) 分数
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        //设置订单信息
        orders.setId(numberId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(numberId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        //向订单表插入数据,一条数据
        this.save(orders);

        //向订单明细表插入数据,多条数据
        orderDetailService.saveBatch(orderDetailList);

        //清空购物车信息
        shoppingCartService.remove(shoppingCartLambdaQueryWrapper);
    }
}
